Consuming smoke in boiler-furnaces and the like.



No. 880,966. PATENTED MAR. s

H. BROAD. (JONSUMING SMOKE IN BOILER FURNACES AND THE LIKE.

APPLICATION FILED NOV. 9, 1906 2 SHEETS-SHEET 1.

THE NORRIS PETERS cm, WASHINGTON, 0. cv

PATENTED MAR. 3, 1908. H. BROAD.

GONSUMING SMOKE IN BOILER FURNACES AND THE LIKE.

APPLICATION FILED NOV.9. 1906. 2 SHEETS-SHEET 2.

rm: nuRRls PETERS cu., WASHINGTON, n c.

UNITED STATES HENRY BROAD, OF LONDON, ENGLAND, ASSIGNOR TO HERBERT BENNETT, OF LONDON,

rn rnnr OFFICE.

ENGLAND.

CONSUMING SMOKE IN BOILER-FURNACES AND THE LIKE.

Application filed November 9, 1906.

To all whom it may concern:

Be it known that I, HENRY BROAD, a subject of the King of Great Britain, residing at 60 Honeywell road, New l/Vandsworth, London, England, have invented new and useful Improvements in Consuming Smoke in Boiler-Furnaces and the Like, of which the following is a specification.

My invention relates to improvements in means for consuming smoke in boiler furnaces and the like.

According to the inventionIprovide at the rear of the fire-grate of the boiler a chamber or box the interior of which is in communication with a supply of air and superheated steam. The mixture of air and steam introduced into the chamber or box and the latter of which is superheated therein issues from the same in the form of a thin sheet or screen of a fan-like shape and comes into contact with the particles of unconsumed carbon, the said particles being violently agitated by the current of steam and air so that they combine therewith and are consumed, Whereby no particles of unconsumed carbon pass over the furnace bridge.

To enable the invention to be fully understood 1 will describe it by reference to the accompanying drawings, in which Figure 1 is a sectional elevation illustrating my improved smoke consuming device. Fig. 2 is a transverse section on the line 22, Fig. 1 with part of the fire-bridge in section, and Fig. 3 is an end view of the same.

a re resents the boiler furnace, b the firebars t ereof and c the chamber or box which' is preferably of cast-iron and is built into brickwork d of the fire-bridge. This chamber or box is formed with an internal space 6 which is preferably of a rectangular shape at its base f and of a narrow, expanded or fan-shape at its outlet end 9. The

ox or chamber 0 is supported upon a deadplate ft to which it is bolted and which carries the fire-bars b and is formed with an orifice 7L1 of the same shape as the orifice To the underside of the said dead-plate it there is attached the elbow-pipe i, the upper end of which is provided with a rectangular opening i also of a corresponding shape to the opening f in the box or chamber 0; the elbow curves downwards and forwards into the ash-pit of the furnace and its orifice is Specification of Letters Patent.

Patented March 3, 1908.

Serial No. 342,676.

I circular at the forward end which is con nected to the air-pipe The said air-pipe j extends along the ash-pit to the front thereof and its outer end is bell-mouthed and open to the atmosphere.

it is a steam-nozzle through which steam is introduced into the air-pipe m is an offset in the elbow pipe i and Z is an inclined weighted flap door for closing the opening in the outer end of the offset. As shown in the drawing, Fig. 1, the offset and door form a substantially triangular dust collecting chamber with an opening to the passage 2' located at the bottom thereof whereby dust and like matter once forced into the chamber is retained therein by the pressure of air and steam. For cleaning the c ust collecting chamber, access thereto may be gained by opening the door Z.

The operation of the apparatus is as follows, steam is forced through the nozzle 7c and so induces a current of air through the pipe the said air mixing with the steam and passing up through the elbow-pipe i into the space 6 in the chamber or box 0. In this chamber the steam is superheated and the mixture issues therefrom through the narrow orifice g in the form of a thin sheet or screen of a fan-like shape. On issuing from the chamber or box 0, which it does with considerable velocity, the mixture of air and steam comes into contact with the particles of unconsumed carbon on their passage to the furnace bridge, the said particles being violently agitated by their impact with the steam and air mixture and consequently consumed so that the products of combustion which eventually leave the furnace contain no unconsumed carbon.

With the construction described, it is obvious that when the chamber or box 0 becomes injured by the heat, as it probably would before any of the other parts were injured, it can be readily replaced by a new one without disturbing the rest of the construction.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is 1. The combination with a furnace having the bridge wall thereof provided with an air discharge passage curving upwardly and forwardly, said passage increasing in width and ecreasing in its vertical diameter toward the top and front of the bridge wall, and terminating in a horizontally disposed discharge slit, adapted to deliver a wide sheet of air forwardly and upwardly, an air pipe extending from the front of the furnace, rearwardly beneath the grate and having at its rear end an upwardly curved portion communicating with and forming a continuation of the air passage in said box, and means for causing a current of air to pass through said pipe from the front of the furnace to said discharge passage in said box, substantially as described.

2. The combination with a furnace,'of a steam and air passage extending from the front to the rear of the furnace beneath the grate, thence upward in a curving direction, through the fire bridge and discharging into the furnace, said passage being provided at its lower rear portion with an offset and a door for closing the same, for collecting and removing dust and like matter, substantially as described.

3. The combination with a furnace, of a steam and air passage extending from the front to the rear of the furnace beneath the grate, thence upward in a curving direction, through the fire bridge and discharging into the furnace, said passage being provided at its lower rear'portion with an offset and a door for giving access thereto, said offset and door forming a substantially triangular chamber, the opening to said steam and air passage being near the bottom at one side thereof, whereby dust and like matter collected in said triangular chamber is prevented from escaping therefrom, substantially as described.

HENRY BROAD. 

